DE68919141D1 - Detector device for measuring the deviation of the focusing. - Google Patents

Detector device for measuring the deviation of the focusing.

Info

Publication number
DE68919141D1
DE68919141D1 DE68919141T DE68919141T DE68919141D1 DE 68919141 D1 DE68919141 D1 DE 68919141D1 DE 68919141 T DE68919141 T DE 68919141T DE 68919141 T DE68919141 T DE 68919141T DE 68919141 D1 DE68919141 D1 DE 68919141D1
Authority
DE
Germany
Prior art keywords
focusing
deviation
measuring
detector device
detector
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
DE68919141T
Other languages
German (de)
Other versions
DE68919141T2 (en
Inventor
Masatomo Mitsubishi Denki Seya
Michihiro Mitsubishi Tadokoro
Kazuo Mitsubishi Denki K Okada
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Application granted granted Critical
Publication of DE68919141D1 publication Critical patent/DE68919141D1/en
Publication of DE68919141T2 publication Critical patent/DE68919141T2/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/135—Means for guiding the beam from the source to the record carrier or from the record carrier to the detector
    • G11B7/1381—Non-lens elements for altering the properties of the beam, e.g. knife edges, slits, filters or stops
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
    • G02B27/10—Beam splitting or combining systems
    • G02B27/16—Beam splitting or combining systems used as aids for focusing
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/08—Disposition or mounting of heads or light sources relatively to record carriers
    • G11B7/09—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following
    • G11B7/0908—Disposition or mounting of heads or light sources relatively to record carriers with provision for moving the light beam or focus plane for the purpose of maintaining alignment of the light beam relative to the record carrier during transducing operation, e.g. to compensate for surface irregularities of the latter or for track following for focusing only
    • G11B7/0916—Foucault or knife-edge methods
    • G—PHYSICS
    • G11—INFORMATION STORAGE
    • G11B—INFORMATION STORAGE BASED ON RELATIVE MOVEMENT BETWEEN RECORD CARRIER AND TRANSDUCER
    • G11B7/00—Recording or reproducing by optical means, e.g. recording using a thermal beam of optical radiation by modifying optical properties or the physical structure, reproducing using an optical beam at lower power by sensing optical properties; Record carriers therefor
    • G11B7/12—Heads, e.g. forming of the optical beam spot or modulation of the optical beam
    • G11B7/13—Optical detectors therefor
DE68919141T 1988-07-21 1989-07-07 Detector device for measuring the deviation of the focusing. Expired - Fee Related DE68919141T2 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP63182109A JPH0231337A (en) 1988-07-21 1988-07-21 Focus error detecting device

Publications (2)

Publication Number Publication Date
DE68919141D1 true DE68919141D1 (en) 1994-12-08
DE68919141T2 DE68919141T2 (en) 1995-06-01

Family

ID=16112491

Family Applications (1)

Application Number Title Priority Date Filing Date
DE68919141T Expired - Fee Related DE68919141T2 (en) 1988-07-21 1989-07-07 Detector device for measuring the deviation of the focusing.

Country Status (4)

Country Link
US (1) US5004900A (en)
EP (1) EP0351675B1 (en)
JP (1) JPH0231337A (en)
DE (1) DE68919141T2 (en)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2591302B2 (en) * 1990-09-26 1997-03-19 松下電器産業株式会社 Focus error detection device
JPH05109143A (en) * 1991-10-18 1993-04-30 Sony Corp Optical pickup device
KR0138337B1 (en) * 1994-07-28 1998-05-15 김광호 Focus control method and apparatus
US6178151B1 (en) * 1997-04-10 2001-01-23 Matsushita Electric Industrial Co., Ltd. Optical head having a reproducing optical system and filter formed by light passing therethrough
JP4210805B2 (en) * 1998-06-05 2009-01-21 株式会社日立プラズマパテントライセンシング Driving method of gas discharge device

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5483848A (en) * 1977-12-16 1979-07-04 Mitsubishi Electric Corp Automatic focusing device
NL7803969A (en) * 1978-04-14 1979-10-16 Philips Nv OPTO-ELECTRONIC FOCUS ERROR DETECTION SYSTEM.
NL8202058A (en) * 1982-05-19 1983-12-16 Philips Nv OPTO-ELECTRONIC FOCUS ERROR DETECTION SYSTEM.
GB2135150A (en) * 1983-02-15 1984-08-22 Gen Electric Optical inspection system
US4654515A (en) * 1983-05-28 1987-03-31 Kabushiki Kaisha Toshiba Optical head for focussing a light beam on an information recording medium
US4687916A (en) * 1984-07-13 1987-08-18 Ricoh Company, Ltd. Optical pick-up device for both focus and error tracking detection
JPS6254224A (en) * 1985-09-03 1987-03-09 Olympus Optical Co Ltd Optical writing reading device

Also Published As

Publication number Publication date
JPH0231337A (en) 1990-02-01
DE68919141T2 (en) 1995-06-01
US5004900A (en) 1991-04-02
EP0351675A2 (en) 1990-01-24
EP0351675B1 (en) 1994-11-02
EP0351675A3 (en) 1990-09-19

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Legal Events

Date Code Title Description
8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee